The mobile app is called DMSS (iDMSS on Apple devices, gDMSS on Android devices). The app can be found by searching on the appropriate App Store. The free version (Lite) allows for live monitoring of up to 16 cameras at once and playback of recorded footage, however the paid version (Plus) allows for device configuration, push notifications, Emap and favorites. DMSS Plus is priced at $4.99. There is also a tablet version of DMSS (HD) which allows for up to 16 cameras, and the HD Plus is priced at $9.99.
Read the article on the updated mobile app (3.20.000) here. Watch videos about the app on DH Vision's Youtube channel.